The number of AI Chrome extensions has exploded in the past year. In 2026, almost every major AI lab has a browser extension, and dozens of third-party tools compete for your toolbar. Most of them are fine. A handful are genuinely useful.
We tested the most popular ones across real work tasks: reading research papers, writing emails, drafting LinkedIn posts, summarizing YouTube videos, and working through long documents. Here's the honest verdict.
The short version: use Sider or Monica if you want to try multiple AI models. Use Nexio AI if you specifically want Claude and care about per-platform specialization. Use Grammarly if your main need is writing quality. Use Perplexity for research with citations.
1. Nexio AI
Nexio AI stands out from the crowd by being Claude-specific and platform-aware. Instead of a generic chatbot in a sidebar, you get specialized tools per context: a YouTube summarizer that actually understands video transcripts, a Gmail assistant that reads your email thread before drafting a reply, a LinkedIn writer tuned for professional posts, and a PDF assistant for document Q&A.
Pros
- Platform-specific tools (Gmail, YouTube, LinkedIn, PDF)
- Free tier with your own Anthropic key
- One Pro key works across all extensions
- Lightweight - no tracking, minimal permissions
- CHF 5.99/month vs $20 for Claude Pro
Cons
- Claude only - no GPT-4 or Gemini options
- Pro tier uses Haiku (not Sonnet/Opus)
- Newer, smaller community
2. Sider
Sider has been around longer than most and has a huge user base. The main value prop is model choice - you can switch between GPT-4, Claude, Gemini, and DeepSeek in the same sidebar. It also has the most automation features: price tracking, 100+ preset commands, and solid translation.
Pros
- Access to every major AI model
- 100+ pre-built commands
- Large, active community
- Good translation and summarization
Cons
- Free tier is quite limited
- UI can feel cluttered
- Permissions footprint is broader
3. Monica
Monica is the Swiss Army knife of AI extensions. Beyond chat and summarization, it adds image generation, translation, and a full writing assistant. The UI is polished and the free tier is more generous than Sider's. For users who want one extension to cover everything, Monica is the strongest pick.
Pros
- Most feature-complete extension
- Good free tier (30 queries/day)
- Image generation built in
- Clean, consistent UI
Cons
- Heavier than single-purpose tools
- Premium is pricier than competitors
- Data handling less transparent
4. Perplexity
Perplexity is in a different category to the others - it's a research tool first. Every answer includes real-time web citations, so you can verify what it's telling you. The extension adds a quick-search sidebar and the ability to ask questions about the current page with source links.
Pros
- Real-time web search with citations
- Excellent for research and fact-checking
- Generous free tier
Cons
- Not great for writing assistance
- Less useful for task-specific tools (email, LinkedIn)
- Pro plan is expensive
5. Grammarly
Grammarly is the most mature product on this list with the deepest writing-specific functionality. It's not a chatbot - it's a writing layer that sits on top of everything you type: emails, docs, forms, LinkedIn posts. In 2026, it's integrated AI generation alongside its core grammar checking.
Pros
- Best-in-class writing quality feedback
- Works everywhere you type
- Tone and clarity analysis
- Trusted, mature product
Cons
- Not a general-purpose AI assistant
- Can be intrusive on some pages
- Premium required for most AI features
6. Claude in Chrome (official)
Anthropic's native extension is the most capable Claude implementation in a browser - it can not only read pages but also click buttons, navigate, and interact with interfaces autonomously. If you're already paying for Claude Pro, this is the obvious choice. If you're not, the cost of entry is steep.
Pros
- Full Claude Sonnet/Opus capability
- Can interact with pages (click, navigate)
- Deep Claude integration
- Official, first-party support
Cons
- Requires $20/month Claude Pro subscription
- No free option
- Overkill for basic sidebar use
Which one should you install?
For most people, the answer comes down to what you actually need:
- Want Claude specifically, at low cost - Nexio AI
- Want to compare multiple AI models - Sider
- Want one extension for everything - Monica
- Research-heavy work, need sources - Perplexity
- Professional writing quality - Grammarly
- Already pay for Claude Pro - Claude in Chrome
The good news: most of these have free tiers, so there's no reason not to try a couple and see what sticks with your actual workflow.
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